BAU Beginning Segment for the Debit Authorization

To identify the beginning of the Debit Authorization transaction set. The BAU segment is used to identify the Financial Institution and Account of the Payer (i.e. the party authorizing the debit against its account)

Position: BAU-01 · Element: 127 · Name: Reference Number · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 30 · Repeat: -

Reference number or identification number as defined for a particular Transaction Set, or as specified by the Reference Number Qualifier.

BAU01 (Reference Number) is assigned by the account holder's application and relevant as an application trace number.

Position: BAU-02 · Element: 591 · Name: Payment Method Code · Type: Identifier (ID) · Requirement: Mandatory · Min: 3 · Max: 3 · Repeat: -

Code identifying the method for the movement of payment instructions

Position: BAU-03 · Element: 506 · Name: (DFI) ID Number Qualifier · Type: Identifier (ID) · Requirement: Mandatory · Min: 2 · Max: 2 · Repeat: -

Code identifying the type of identification number of Depository Financial Institution (DFI).

Position: BAU-04 · Element: 507 · Name: (DFI) Identification Number · Type: String (AN) · Requirement: Mandatory · Min: 3 · Max: 12 · Repeat: -

Depository Financial Institution (DFI) identification number.

Position: BAU-05 · Element: 508 · Name: Account Number · Type: String (AN) · Requirement: Mandatory · Min: 1 · Max: 35 · Repeat: -

Account number assigned.

Position: BAU-06 · Element: 93 · Name: Name · Type: String (AN) · Requirement: Optional · Min: 1 · Max: 35 · Repeat: -

Free-form name.

BAU06 identifies the party holding the account being debited. If used, it further serves to identify the account holder to the financial institution.